Machine



(No Mrlndel.) 2 Sheets-Sheet 1.

. T. A. MAGAULAY.

SEWING MACHINE. 1Y0-.265.68% Patented-0n 10,188.2.

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g4/WL? (No Model.) 2 Sheets-Sheet 2.

T. A. MACAULAY.

SEWING MACHINE. No. 265,687. Patented oct. 1.0.1882.

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' UNITED STATES PATENT OEETOE.

THOMAS A. MAOAULAY, OF NEw YORK, N. Y'.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 265,687, dated October10, 1882,

Application filed July l, 1832. (No model.)

To all whom it may concern:

Be it known that I, THOMAS A. MAGAULAY, of the city, county, and Statevot' New York, have invented new and useful Improvements inSewing-Machines, of which the followingis a specification.

ln the accompanying drawings similar letters refer to like parts.

Myinvention relates to that class of sewn gmachines in which a mainrotary shaft in the bracket-arm rotates a feed-shaft located beneath thebed-plate and operates a shuttledriving lever by intervening mechanism,hereinafter more fully described.

In the drawings, Figure l is a side elevation. Fig. 2 is a sectional endView through the dotted line indicated by the arrows in Fig. 1. Fig. 3represents a bottom view of the bedplate, showing the shuttle-lever andthe feedoperating mechanism. Figs. 4 and 5 are detail views ofmodifications.

A is the arin,and A is the'hed,of a sewingmachine. B is the main shaft.B isa disk. U is a drivin g-pulley. D D are eccentrics fixed to theshaft B. E is a pitman.v F is a connecting-lever. F is a stud. G G isapitman-lever. H is a shuttle-lever. H is a stud. I is a feed-shaft. lis a crank. gisalink. .t is a shuttle. J J are cams. K is astitchregulating lever.' K is a slot in the stitchregulating lever. K2is a crank-pin. K3 is the feed-bar. K4 is a bent portion ofthe lever K.L is a milled-headed t-humb-nut,havingashaft ending in the crank-pin K2.n is a stud on which lever K is pivoted. n is a bracket extending fromthe feed-bar, and to which the leverK is pivoted. M is a needle-bar. .Nis the presser-foot. O is a friction-plate and retainer for themilled-headed thumb-screw. I? is a feed-spring. The friction-spring andretainer 0 is forked and passes into a groovein the shaft of themilled-headed thumb-nut L, and is held down against it by the screw b.This piece serves to keep the nut L in position, as well as to applyafriction to it to keep it from moving while the machine is in motion,but is light enough to permit the milled head to be moved by the fingerwhen desired. The take-up c is of ordinary construction. The tension cis the well-known wheel-tensioii.

The manner of operatin g the feed-bar may by any other well-known formof cam; as well as the one shown herein.

Motion being given to the main shaft B, the needle-bar M, carrying theneedle at its lower end, secures the requisite motion from thecrank-disk B in the usual way. The eccentric D is connected by the rod Eto the short arm of the connecting bell-crank lever F, the long arm ofwhich is connected to the shuttleleverH by a ba'll-and-slotjoiiit. rIheeccentric D is connected with the feed-shaft I by the 4pitman-lever G G,radius-bar G', link g, and

crank I. A cani, J J,1iXed to the shaft I, connects with the feed-bar K3to lift it, and with the regulating-lever K pivoted to it atn, and, inconnection with the spring I?, gives the requisite forward and backmotions to the feedbar, the presser-foot N holding the material againstthe feed. rIhe combined movements of the above-enumerated parts from asingle rotation of the main shaft produce a single stitch. The length ofstitch is regulated by turning the milled thumb-nut L, which has acrank, K2, extending from its shaft and entering a slot in thestitch-regulating lever K. This crank moves the extreme end K4 of leverK lalong the conical portion J of the cain J J. The lever K has aportion, K4, bent at nearly a right angle, and is held against the camby the feed-spring P for giving the feed-bar its forward motion, thelength of stitch being equal to the throw of the cam at the point whichis in contact with the bentpartK4of the lever K. The feed is raised bythe portion J of the cam J J immediately under the feedbar K3. Theeccentrics D D are in opposite positions on the shaft to counteractvibration 5 but it is4 manifest that they maybe in the saine direction.A single eccentric with a face broad enough to receive both the strapsof the rods E and G would give the requisite motions, or a single crankon a bent shaft carrying both connections would answer the purpose ofthe two eccentrics, as shown in Figs. 4 and 5.

The lever F and radins-har G are mounted on a common stud, F; butseparate studs may be used, and for the radius-bar G may be substitutedthe well-known slot and pin.

The advantage of the shuttle and feed operating mechanism herein shownis that, being limited to their separate functions of shuttle ICO andfeed operating, the parts may be made lighter and run at a higher rateof speed, AWhile each mechanism unites with all the others to produce aunit of result-the production of one stitch.

By plaein g the eccentrics opposite each other the vibration isneutralized, and when made from a singlepicce, as shown in Fig. 1, butone boring and fastening is necessary to iiX them to the shaft.

The stitch-regulating mechanism is simple, durable, and convenient formanipulation.

Having thus described my invention, I claim- 1. In a sewing-machine, thecombination of the shafeB and eccentries D D thereon with theshuttle-driving mechanism E, F, and H and feed-operating mechanism G G gI If, substantially as set forth.

2. The combination of the eccentrics D D', 2o pitman E, levers F and G,stud F', and. radiusbar G', said lever F and radius-bar G being mountedon said stud F', substantially as described.

3. The conical cam J, fixed to the feed-shaft 25 I, in combination withthe feed-bar K3, stitchregulating level` K, having the slot K and bentportion K4, thecrankpin K2, and spring P, substantially as set forth.

THOS. A. MAUAULAY.

